I have a SBC 383 pushing over 500hp to the flywheel. I'm currently in the process of rebuilding the engine (ported my heads/new cam (solid roller) ect.. Well I was wanting to uprgrade my mechanical fuel pump to a better one. I don't want to go electric (yet). But was thinking of the following 2. I think the 110 GPH would be good. I like the 170 GPH but don't want to have to change over to AN fittings right now (both don't need regulators, which again I don't want to add. What are your thoughts? or is there a different one that might fit the bill. Again looking to stay away from regulators right now and electric.